I have a 14.4V charger for my ryobi drill. It has three lights on it ...yellow on the left with no text...green in the middle with text "fully charged"...red on the right with text "fast charge".

I bought my drill used from ryobi and it did not come with an owners manual. I have two batteries and one goes into fast charge mode almost immediately, when I plug it in...the other one doesn't. It just lights up the yellow and green light until it is fully charged, then the yellow light goes out.

Both batteries need to be replaced, as they aren't holding a charge very long any more, but I was wondering why they don't both go into fast charge mode. Does anyone know what that means?

go to product support, and then that page above should be able to be found under product information,

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more than likely this is the same situation as with yours even if it is not the same number,

it appears as if one battery is getting hot or the charger thinks it is hot and the other is not as hot, or it is defective.

Quote:

IMPORTANT INFORMATION FOR RECHARGING HOT BATTERIES USING CHARGER PART
NUMBER 1400677
When using your drill-driver continuously, the batteries in your battery pack will become hot. You should let a hot battery
pack cool down for approximately 30 minutes before attempting to recharge. When the battery pack becomes discharged
and is hot, this will cause the red light on your battery charger to flash. When battery pack cools down, red light will glow
continuously indicating fast charging mode, 1 hour charge time. Once the battery pack cools down, it will recharge battery
pack in fast charging mode as normal.
IMPORTANT INFORMATION FOR RECHARGING HOT BATTERIES USING CHARGER PART
NUMBER 1400666, 1400656, OR 1400667
When using your drill-driver continuously, the batteries in your battery pack will become hot. You should let a hot battery
pack cool down for approximately 30 minutes before attempting to recharge. When the battery pack becomes discharged
and is hot, this will cause the yellow and green lights on your battery charger to come on instead of the red light. The yellow
and green lights indicate soft start mode and will switch to green only, indicating slow charge mode. The red light indicates
fast charge mode, 1 hour charge time. The green light indicates slow charge mode, requiring overnight charging for
batteries to reach full charge. If the green light comes on after letting battery pack cool down, remove it from charger for
additional cooling.
Once the battery pack cools down, it will recharge battery pack in fast charging mode as normal.
Do not leave a hot battery pack in charger until it cools down. The green light will not go off when battery pack cools. If fast
charge mode is desired, you must physically remove a hot battery pack from the charger, let it cool, then place it back in
charger after it has cooled down. Once the battery pack cools down, it will recharge battery pack in fast charging mode as
normal.
NOTE: This situation only occurs when continuous use of your drill-driver causes the batteries to become hot. It does not
occur under normal circumstances. Refer to "CHARGING YOUR DRILL-DRIVER" for normal recharging of batteries.
If the charger does not charge your battery pack under normal circumstances, return both the battery pack and charger to
your nearest Ryobi Authorized Repair Center for electrical check.http://oneworld1.inetu.net/manuals/r..._21_31_eng.pdf

CHARGING YOUR DRILL-DRIVER
The battery pack for this tool has been shipped in a low
charge condition to prevent possible problems. Therefore,
you should charge it prior to use.
Note: Batteries will not reach full charge the first time they are
charged. Allow several cycles (drilling followed by recharging)
for them to fully charge.
TO CHARGE
Charge battery pack only with the charger provided.
Make sure power supply is normal house voltage, 120
volts, 60 Hz, AC only.
Connect charger to power supply.
Place battery pack in charger aligning raised rib in charger
with groove in battery pack.
Press down on battery pack to be sure contacts on battery
pack engage properly with charger contacts. When properly
connected, red light will turn on.
When your battery pack becomes fully charged, the red
light will turn off and the green light will turn on.
After normal usage, 1 hour of charge time is required to be
fully charged. A minimum charge time of 1-1/2 hours is
required to recharge a completely discharged tool.
The battery pack will become slightly warm to the touch
while charging. This is normal and does not indicate a
problem.
DO NOT place charger in an area of extreme heat or cold.
It will work best at normal room temperature.
When the batteries become fully charged, unplug your
charger from power supply and remove the battery pack.
CHARGING WITH CHARGER 1400677
See Figure 2.
If red light is flashing, this indicates battery pack is deeply
discharged or hot.
If battery pack is hot, red light should become steady after
battery pack has cooled down.
If battery pack is deeply discharged, red light should become
steady after voltage has increased, normally within 30
minutes.
If after one hour red light is still flashing, this indicates a
defective battery pack and should be replaced.
Green light on indicates battery pack is fully charged or in
slow charging mode to maintain battery pack charge.
Yellow light on and red light flashing indicates defective
battery pack. Return battery pack to your nearest Ryobi
Authorized Service Center for checking or replacing.
~~~~~~~~~~~~
CHARGING WITH CHARGER 1400666, 1400656, OR 1400667
See Figure 3.
Normally, the yellow and green lights on charger will come on. This indicates charger is in control charge mode and
should switch to fast charge mode within 5 minutes. When charger is in fast charge mode the red light will come on. If
after a period of 15 minutes the yellow and green lights remain on, remove battery pack, wait 1 minute and reinsert
battery pack in charger. If the yellow and green lights continue to remain on after an additional 15 minutes, the battery
pack is damaged and will not accept a charge.
~~~~~~~~~~~~~
LED FUNCTION OF CHARGER 1400666, 1400656 AND 1400667
LED WILL BE LIGHTED TO INDICATE STATUS OF CHARGER AND BATTERY PACK:
Red LED Lighted = Fast Charging Mode.
Green LED Lighted = Fully Charged Or In Slow Charging Mode To Maintain Battery Pack.
Yellow and Green LED Lighted = Soft Start Mode Or After 1/2 Hour Equals Hot Or Defective Battery Pack.